sui generis

1. 1.

   constituting a class of its own; unique

   “a history book sui generis”

   “sui generis works like Mary Chestnut's Civil War diary”

   Similarsingle

Questions about sui generis

What does sui generis mean?

sui generis means "constituting a class of its own; unique".

Is sui generis a common word?

sui generis is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.